<template>
  <div>
    <!-- 工作日历, 年和月 -->
    <div class="select-box">
      <el-select
        v-model="currentYear"
        size="small"
        style="width: 120px; margin-right: 10px"
        @change="changeDate()"
      >
        <!-- 年份取给定年份的, 前五年 + 后五年 -->
        <el-option
          v-for="item in yearList"
          :key="item"
          :label="item"
          :value="item"
        />
      </el-select>
      <el-select
        v-model="currentMonth"
        size="small"
        style="width: 120px;"
        @change="changeDate()"
      >
        <el-option v-for="item in 12" :key="item" :label="item" :value="item" />
      </el-select>
    </div>
    <el-calendar v-model="currentDate">
      <template #dateCell="{date,data}">
        <!-- data.day拿到的是YYYY-MM-DD（element文档）,对字符串分割，取数组的第三项，再转回字符串 -->
        <div class="date-content">
          <div class="text">
            {{
              data.day
                .split('-')
                .slice(2)
                .join('-')
            }}
          </div>
          <div v-if="isweek(data.day)" class="rest">休</div>
        </div>
      </template>
    </el-calendar>
  </div>
</template>

<script>
export default {
  props: {
    startDate: {
      // 复杂类型，给初始值，需要通过函数里面return给默认值
      type: Date,
      default: () => {
        return new Date()
      }
    }
  },
  data() {
    return {
      currentDate: new Date(), // 当前的时间
      currentYear: null, // 当前年份
      currentMonth: null // 当前月份
      //   yearList: [] // 要遍历的年的数组
    }
  },
  computed: {
    yearList() {
      const date = new Date().getFullYear()
      const arr = Array.from(new Array(11)).map(
        (item, index) => index + date - 5
      )
      return arr
    }
  },
  watch: {
    currentDate(newV) {
      this.currentYear = newV.getFullYear()
      this.currentMonth = newV.getMonth() + 1
    }
  },
  created() {
    this.currentYear = this.startDate.getFullYear() // 得到当前年份
    this.currentMonth = this.startDate.getMonth() + 1 // 当前月份
  },
  methods: {
    isweek(date) {
      const day = new Date(date).getDay()
      // 等于周六或周天时
      return day === 6 || day === 0
    },
    changeDate() {
      // 拿到选择的年份和月份，对日历插件重新赋值
      this.currentDate = new Date(`${this.currentYear}-${this.currentMonth}`)
    }
  }
}
</script>

<style lang="scss" scoped>
.select-box {
  display: flex;
  justify-content: flex-end;
}

::v-deep .el-calendar-day {
  height: auto;
}
::v-deep
  .el-calendar-table__row
  td::v-deep
  .el-calendar-table
  tr
  td:first-child,
::v-deep .el-calendar-table__row td.prev {
  border: none;
}
.date-content {
  height: 40px;
  text-align: center;
  line-height: 40px;
  font-size: 14px;
}
.date-content .rest {
  color: #fff;
  border-radius: 50%;
  background: rgb(250, 124, 77);
  width: 20px;
  height: 20px;
  line-height: 20px;
  display: inline-block;
  font-size: 12px;
  margin-left: 10px;
}
.date-content .text {
  width: 20px;
  height: 20px;
  line-height: 20px;
  display: inline-block;
}
::v-deep .el-calendar-table td.is-selected .text {
  background: #409eff;
  color: #fff;
  border-radius: 50%;
}
::v-deep .el-calendar__header {
  display: none;
}
</style>
